services/audiopolicy/engineconfigurable/wrapper/ParameterManagerWrapper.cpp - android_frameworks_av - Gitiles

 /*
  * Copyright (C) 2015 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #define LOG_TAG "APM::AudioPolicyEngine/PFWWrapper"
 //#define LOG_NDEBUG 0

 #include "ParameterManagerWrapper.h"
 #include "audio_policy_criteria_conf.h"
 #include <ParameterMgrPlatformConnector.h>
 #include <SelectionCriterionTypeInterface.h>
 #include <SelectionCriterionInterface.h>
 #include <media/convert.h>
 #include <algorithm>
 #include <cutils/config_utils.h>
 #include <cutils/misc.h>
 #include <fstream>
 #include <limits>
 #include <sstream>
 #include <string>
 #include <vector>
 #include <stdint.h>
 #include <cmath>
 #include <utils/Log.h>

 using std::string;
 using std::map;
 using std::vector;

 /// PFW related definitions
 // Logger
 class ParameterMgrPlatformConnectorLogger : public CParameterMgrPlatformConnector::ILogger
 {
 public:
     ParameterMgrPlatformConnectorLogger() {}

     virtual void info(const string &log)
     {
         ALOGD("policy-parameter-manager: %s", log.c_str());
     }
     virtual void warning(const string &log)
     {
         ALOGW("policy-parameter-manager: %s", log.c_str());
     }
 };

 namespace android
 {

 using utilities::convertTo;

 namespace audio_policy
 {
 const char *const ParameterManagerWrapper::mPolicyPfwDefaultConfFileName =
     "/etc/parameter-framework/ParameterFrameworkConfigurationPolicy.xml";

 template <>
 struct ParameterManagerWrapper::parameterManagerElementSupported<ISelectionCriterionInterface> {};
 template <>
 struct ParameterManagerWrapper::parameterManagerElementSupported<ISelectionCriterionTypeInterface> {};

 ParameterManagerWrapper::ParameterManagerWrapper()
     : mPfwConnectorLogger(new ParameterMgrPlatformConnectorLogger)
 {
     // Connector
     mPfwConnector = new CParameterMgrPlatformConnector(mPolicyPfwDefaultConfFileName);

     // Logger
     mPfwConnector->setLogger(mPfwConnectorLogger);

     // Load criteria file
     if ((loadAudioPolicyCriteriaConfig(gAudioPolicyCriteriaVendorConfFilePath) != NO_ERROR) &&
         (loadAudioPolicyCriteriaConfig(gAudioPolicyCriteriaConfFilePath) != NO_ERROR)) {
         ALOGE("%s: Neither vendor conf file (%s) nor system conf file (%s) could be found",
               __FUNCTION__, gAudioPolicyCriteriaVendorConfFilePath,
               gAudioPolicyCriteriaConfFilePath);
     }
 }

 ParameterManagerWrapper::~ParameterManagerWrapper()
 {
     // Unset logger
     mPfwConnector->setLogger(NULL);
     // Remove logger
     delete mPfwConnectorLogger;
     // Remove connector
     delete mPfwConnector;
 }

 status_t ParameterManagerWrapper::start()
 {
     ALOGD("%s: in", __FUNCTION__);
     /// Start PFW
     std::string error;
     if (!mPfwConnector->start(error)) {
         ALOGE("%s: Policy PFW start error: %s", __FUNCTION__, error.c_str());
         return NO_INIT;
     }
     ALOGD("%s: Policy PFW successfully started!", __FUNCTION__);
     return NO_ERROR;
 }


 void ParameterManagerWrapper::addCriterionType(const string &typeName, bool isInclusive)
 {
     ALOG_ASSERT(mPolicyCriterionTypes.find(typeName) == mPolicyCriterionTypes.end(),
                       "CriterionType %s already added", typeName.c_str());
     ALOGD("%s: Adding new criterionType %s", __FUNCTION__, typeName.c_str());

     mPolicyCriterionTypes[typeName] = mPfwConnector->createSelectionCriterionType(isInclusive);
 }

 void ParameterManagerWrapper::addCriterionTypeValuePair(
     const string &typeName,
     uint32_t numericValue,
     const string &literalValue)
 {
     ALOG_ASSERT(mPolicyCriterionTypes.find(typeName) != mPolicyCriterionTypes.end(),
                       "CriterionType %s not found", typeName.c_str());
     ALOGV("%s: Adding new value pair (%d,%s) for criterionType %s", __FUNCTION__,
           numericValue, literalValue.c_str(), typeName.c_str());
     ISelectionCriterionTypeInterface *criterionType = mPolicyCriterionTypes[typeName];
     std::string error;
     criterionType->addValuePair(numericValue, literalValue, error);
 }

 void ParameterManagerWrapper::loadCriterionType(cnode *root, bool isInclusive)
 {
     ALOG_ASSERT(root != NULL, "error in parsing file");
     cnode *node;
     for (node = root->first_child; node != NULL; node = node->next) {

         ALOG_ASSERT(node != NULL, "error in parsing file");
         const char *typeName = node->name;
         char *valueNames = strndup(node->value, strlen(node->value));

         addCriterionType(typeName, isInclusive);

         uint32_t index = 0;
         char *ctx;
         char *valueName = strtok_r(valueNames, ",", &ctx);
         while (valueName != NULL) {
             if (strlen(valueName) != 0) {

                 // Conf file may use or not pair, if no pair, use incremental index, else
                 // use provided index.
                 if (strchr(valueName, ':') != NULL) {

                     char *first = strtok(valueName, ":");
                     char *second = strtok(NULL, ":");
                     ALOG_ASSERT((first != NULL) && (strlen(first) != 0) &&
                                       (second != NULL) && (strlen(second) != 0),
                                       "invalid value pair");

                     if (!convertTo<string, uint32_t>(first, index)) {
                         ALOGE("%s: Invalid index(%s) found", __FUNCTION__, first);
                     }
                     addCriterionTypeValuePair(typeName, index, second);
                 } else {

                     uint32_t pfwIndex = isInclusive ? 1 << index : index;
                     addCriterionTypeValuePair(typeName, pfwIndex, valueName);
                     index += 1;
                 }
             }
             valueName = strtok_r(NULL, ",", &ctx);
         }
         free(valueNames);
     }
 }

 void ParameterManagerWrapper::loadInclusiveCriterionType(cnode *root)
 {
     ALOG_ASSERT(root != NULL, "error in parsing file");
     cnode *node = config_find(root, gInclusiveCriterionTypeTag.c_str());
     if (node == NULL) {
         return;
     }
     loadCriterionType(node, true);
 }

 void ParameterManagerWrapper::loadExclusiveCriterionType(cnode *root)
 {
     ALOG_ASSERT(root != NULL, "error in parsing file");
     cnode *node = config_find(root, gExclusiveCriterionTypeTag.c_str());
     if (node == NULL) {
         return;
     }
     loadCriterionType(node, false);
 }

 void ParameterManagerWrapper::parseChildren(cnode *root, string &defaultValue, string &type)
 {
     ALOG_ASSERT(root != NULL, "error in parsing file");
     cnode *node;
     for (node = root->first_child; node != NULL; node = node->next) {
         ALOG_ASSERT(node != NULL, "error in parsing file");

         if (string(node->name) == gDefaultTag) {
             defaultValue = node->value;
         } else if (string(node->name) == gTypeTag) {
             type = node->value;
         } else {
              ALOGE("%s: Unrecognized %s %s node", __FUNCTION__, node->name, node->value);
         }
     }
 }

 template <typename T>
 T *ParameterManagerWrapper::getElement(const string &name, std::map<string, T *> &elementsMap)
 {
     parameterManagerElementSupported<T>();
     typename std::map<string, T *>::iterator it = elementsMap.find(name);
     ALOG_ASSERT(it != elementsMap.end(), "Element %s not found", name.c_str());
     return it != elementsMap.end() ? it->second : NULL;
 }

 template <typename T>
 const T *ParameterManagerWrapper::getElement(const string &name, const std::map<string, T *> &elementsMap) const
 {
     parameterManagerElementSupported<T>();
     typename std::map<string, T *>::const_iterator it = elementsMap.find(name);
     ALOG_ASSERT(it != elementsMap.end(), "Element %s not found", name.c_str());
     return it != elementsMap.end() ? it->second : NULL;
 }

 void ParameterManagerWrapper::loadCriteria(cnode *root)
 {
     ALOG_ASSERT(root != NULL, "error in parsing file");
     cnode *node = config_find(root, gCriterionTag.c_str());

     if (node == NULL) {
         ALOGW("%s: no inclusive criteria found", __FUNCTION__);
         return;
     }
     for (node = node->first_child; node != NULL; node = node->next) {
         loadCriterion(node);
     }
 }

 void ParameterManagerWrapper::addCriterion(const string &name, const string &typeName,
                               const string &defaultLiteralValue)
 {
     ALOG_ASSERT(mPolicyCriteria.find(name) == mPolicyCriteria.end(),
                 "Route Criterion %s already added", name.c_str());

     ISelectionCriterionTypeInterface *criterionType =
             getElement<ISelectionCriterionTypeInterface>(typeName, mPolicyCriterionTypes);

     ISelectionCriterionInterface *criterion =
             mPfwConnector->createSelectionCriterion(name, criterionType);

     mPolicyCriteria[name] = criterion;
     int numericalValue = 0;
     if (!criterionType->getNumericalValue(defaultLiteralValue.c_str(),  numericalValue)) {
         ALOGE("%s; trying to apply invalid default literal value (%s)", __FUNCTION__,
               defaultLiteralValue.c_str());
     }
     criterion->setCriterionState(numericalValue);
 }

 void ParameterManagerWrapper::loadCriterion(cnode *root)
 {
     ALOG_ASSERT(root != NULL, "error in parsing file");
     const char *criterionName = root->name;

     ALOG_ASSERT(mPolicyCriteria.find(criterionName) == mPolicyCriteria.end(),
                       "Criterion %s already added", criterionName);

     string paramKeyName = "";
     string path = "";
     string typeName = "";
     string defaultValue = "";

     parseChildren(root, defaultValue, typeName);

     addCriterion(criterionName, typeName, defaultValue);
 }

 void ParameterManagerWrapper::loadConfig(cnode *root)
 {
     ALOG_ASSERT(root != NULL, "error in parsing file");
     cnode *node = config_find(root, gPolicyConfTag.c_str());
     if (node == NULL) {
         ALOGW("%s: Could not find node for pfw", __FUNCTION__);
         return;
     }
     ALOGD("%s: Loading conf for pfw", __FUNCTION__);
     loadInclusiveCriterionType(node);
     loadExclusiveCriterionType(node);
     loadCriteria(node);
 }


 status_t ParameterManagerWrapper::loadAudioPolicyCriteriaConfig(const char *path)
 {
     ALOG_ASSERT(path != NULL, "error in parsing file: empty path");
     cnode *root;
     char *data;
     ALOGD("%s", __FUNCTION__);
     data = (char *)load_file(path, NULL);
     if (data == NULL) {
         return -ENODEV;
     }
     root = config_node("", "");
     ALOG_ASSERT(root != NULL, "Unable to allocate a configuration node");
     config_load(root, data);

     loadConfig(root);

     config_free(root);
     free(root);
     free(data);
     ALOGD("%s: loaded", __FUNCTION__);
     return NO_ERROR;
 }

 bool ParameterManagerWrapper::isStarted()
 {
     return mPfwConnector && mPfwConnector->isStarted();
 }

 status_t ParameterManagerWrapper::setPhoneState(audio_mode_t mode)
 {
     ISelectionCriterionInterface *criterion =
             getElement<ISelectionCriterionInterface>(gPhoneStateCriterionTag, mPolicyCriteria);
     if (criterion == NULL) {
         ALOGE("%s: no criterion found for %s", __FUNCTION__, gPhoneStateCriterionTag.c_str());
         return BAD_VALUE;
     }
     if (!isValueValidForCriterion(criterion, static_cast<int>(mode))) {
         return BAD_VALUE;
     }
     criterion->setCriterionState((int)(mode));
     applyPlatformConfiguration();
     return NO_ERROR;
 }

 audio_mode_t ParameterManagerWrapper::getPhoneState() const
 {
     const ISelectionCriterionInterface *criterion =
             getElement<ISelectionCriterionInterface>(gPhoneStateCriterionTag, mPolicyCriteria);
     if (criterion == NULL) {
         ALOGE("%s: no criterion found for %s", __FUNCTION__, gPhoneStateCriterionTag.c_str());
         return AUDIO_MODE_NORMAL;
     }
     return static_cast<audio_mode_t>(criterion->getCriterionState());
 }

 status_t ParameterManagerWrapper::setForceUse(audio_policy_force_use_t usage,
                                               audio_policy_forced_cfg_t config)
 {
     // @todo: return an error on a unsupported value
     if (usage > AUDIO_POLICY_FORCE_USE_CNT) {
         return BAD_VALUE;
     }

     ISelectionCriterionInterface *criterion =
             getElement<ISelectionCriterionInterface>(gForceUseCriterionTag[usage], mPolicyCriteria);
     if (criterion == NULL) {
         ALOGE("%s: no criterion found for %s", __FUNCTION__, gForceUseCriterionTag[usage].c_str());
         return BAD_VALUE;
     }
     if (!isValueValidForCriterion(criterion, static_cast<int>(config))) {
         return BAD_VALUE;
     }
     criterion->setCriterionState((int)config);
     applyPlatformConfiguration();
     return NO_ERROR;
 }

 audio_policy_forced_cfg_t ParameterManagerWrapper::getForceUse(audio_policy_force_use_t usage) const
 {
     // @todo: return an error on a unsupported value
     if (usage > AUDIO_POLICY_FORCE_USE_CNT) {
         return AUDIO_POLICY_FORCE_NONE;
     }
     const ISelectionCriterionInterface *criterion =
             getElement<ISelectionCriterionInterface>(gForceUseCriterionTag[usage], mPolicyCriteria);
     if (criterion == NULL) {
         ALOGE("%s: no criterion found for %s", __FUNCTION__, gForceUseCriterionTag[usage].c_str());
         return AUDIO_POLICY_FORCE_NONE;
     }
     return static_cast<audio_policy_forced_cfg_t>(criterion->getCriterionState());
 }

 bool ParameterManagerWrapper::isValueValidForCriterion(ISelectionCriterionInterface *criterion,
                                                        int valueToCheck)
 {
     const ISelectionCriterionTypeInterface *interface = criterion->getCriterionType();
     string literalValue;
     return interface->getLiteralValue(valueToCheck, literalValue);
 }

 status_t ParameterManagerWrapper::setAvailableInputDevices(audio_devices_t inputDevices)
 {
     ISelectionCriterionInterface *criterion =
             getElement<ISelectionCriterionInterface>(gInputDeviceCriterionTag, mPolicyCriteria);
     if (criterion == NULL) {
         ALOGE("%s: no criterion found for %s", __FUNCTION__, gInputDeviceCriterionTag.c_str());
         return DEAD_OBJECT;
     }
     criterion->setCriterionState(inputDevices & ~AUDIO_DEVICE_BIT_IN);
     applyPlatformConfiguration();
     return NO_ERROR;
 }

 status_t ParameterManagerWrapper::setAvailableOutputDevices(audio_devices_t outputDevices)
 {
     ISelectionCriterionInterface *criterion =
             getElement<ISelectionCriterionInterface>(gOutputDeviceCriterionTag, mPolicyCriteria);
     if (criterion == NULL) {
         ALOGE("%s: no criterion found for %s", __FUNCTION__, gOutputDeviceCriterionTag.c_str());
         return DEAD_OBJECT;
     }
     criterion->setCriterionState(outputDevices);
     applyPlatformConfiguration();
     return NO_ERROR;
 }

 void ParameterManagerWrapper::applyPlatformConfiguration()
 {
     mPfwConnector->applyConfigurations();
 }

 } // namespace audio_policy
 } // namespace android
	/*
	* Copyright (C) 2015 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#define LOG_TAG "APM::AudioPolicyEngine/PFWWrapper"
	//#define LOG_NDEBUG 0

	#include "ParameterManagerWrapper.h"
	#include "audio_policy_criteria_conf.h"
	#include <ParameterMgrPlatformConnector.h>
	#include <SelectionCriterionTypeInterface.h>
	#include <SelectionCriterionInterface.h>
	#include <media/convert.h>
	#include <algorithm>
	#include <cutils/config_utils.h>
	#include <cutils/misc.h>
	#include <fstream>
	#include <limits>
	#include <sstream>
	#include <string>
	#include <vector>
	#include <stdint.h>
	#include <cmath>
	#include <utils/Log.h>

	using std::string;
	using std::map;
	using std::vector;

	/// PFW related definitions
	// Logger
	class ParameterMgrPlatformConnectorLogger : public CParameterMgrPlatformConnector::ILogger
	{
	public:
	ParameterMgrPlatformConnectorLogger() {}

	virtual void info(const string &log)
	{
	ALOGD("policy-parameter-manager: %s", log.c_str());
	}
	virtual void warning(const string &log)
	{
	ALOGW("policy-parameter-manager: %s", log.c_str());
	}
	};

	namespace android
	{

	using utilities::convertTo;

	namespace audio_policy
	{
	const char *const ParameterManagerWrapper::mPolicyPfwDefaultConfFileName =
	"/etc/parameter-framework/ParameterFrameworkConfigurationPolicy.xml";

	template <>
	struct ParameterManagerWrapper::parameterManagerElementSupported<ISelectionCriterionInterface> {};
	template <>
	struct ParameterManagerWrapper::parameterManagerElementSupported<ISelectionCriterionTypeInterface> {};

	ParameterManagerWrapper::ParameterManagerWrapper()
	: mPfwConnectorLogger(new ParameterMgrPlatformConnectorLogger)
	{
	// Connector
	mPfwConnector = new CParameterMgrPlatformConnector(mPolicyPfwDefaultConfFileName);

	// Logger
	mPfwConnector->setLogger(mPfwConnectorLogger);

	// Load criteria file
	if ((loadAudioPolicyCriteriaConfig(gAudioPolicyCriteriaVendorConfFilePath) != NO_ERROR) &&
	(loadAudioPolicyCriteriaConfig(gAudioPolicyCriteriaConfFilePath) != NO_ERROR)) {
	ALOGE("%s: Neither vendor conf file (%s) nor system conf file (%s) could be found",
	__FUNCTION__, gAudioPolicyCriteriaVendorConfFilePath,
	gAudioPolicyCriteriaConfFilePath);
	}
	}

	ParameterManagerWrapper::~ParameterManagerWrapper()
	{
	// Unset logger
	mPfwConnector->setLogger(NULL);
	// Remove logger
	delete mPfwConnectorLogger;
	// Remove connector
	delete mPfwConnector;
	}

	status_t ParameterManagerWrapper::start()
	{
	ALOGD("%s: in", __FUNCTION__);
	/// Start PFW
	std::string error;
	if (!mPfwConnector->start(error)) {
	ALOGE("%s: Policy PFW start error: %s", __FUNCTION__, error.c_str());
	return NO_INIT;
	}
	ALOGD("%s: Policy PFW successfully started!", __FUNCTION__);
	return NO_ERROR;
	}


	void ParameterManagerWrapper::addCriterionType(const string &typeName, bool isInclusive)
	{
	ALOG_ASSERT(mPolicyCriterionTypes.find(typeName) == mPolicyCriterionTypes.end(),
	"CriterionType %s already added", typeName.c_str());
	ALOGD("%s: Adding new criterionType %s", __FUNCTION__, typeName.c_str());

	mPolicyCriterionTypes[typeName] = mPfwConnector->createSelectionCriterionType(isInclusive);
	}

	void ParameterManagerWrapper::addCriterionTypeValuePair(
	const string &typeName,
	uint32_t numericValue,
	const string &literalValue)
	{
	ALOG_ASSERT(mPolicyCriterionTypes.find(typeName) != mPolicyCriterionTypes.end(),
	"CriterionType %s not found", typeName.c_str());
	ALOGV("%s: Adding new value pair (%d,%s) for criterionType %s", __FUNCTION__,
	numericValue, literalValue.c_str(), typeName.c_str());
	ISelectionCriterionTypeInterface *criterionType = mPolicyCriterionTypes[typeName];
	std::string error;
	criterionType->addValuePair(numericValue, literalValue, error);
	}

	void ParameterManagerWrapper::loadCriterionType(cnode *root, bool isInclusive)
	{
	ALOG_ASSERT(root != NULL, "error in parsing file");
	cnode *node;
	for (node = root->first_child; node != NULL; node = node->next) {

	ALOG_ASSERT(node != NULL, "error in parsing file");
	const char *typeName = node->name;
	char *valueNames = strndup(node->value, strlen(node->value));

	addCriterionType(typeName, isInclusive);

	uint32_t index = 0;
	char *ctx;
	char *valueName = strtok_r(valueNames, ",", &ctx);
	while (valueName != NULL) {
	if (strlen(valueName) != 0) {

	// Conf file may use or not pair, if no pair, use incremental index, else
	// use provided index.
	if (strchr(valueName, ':') != NULL) {

	char *first = strtok(valueName, ":");
	char *second = strtok(NULL, ":");
	ALOG_ASSERT((first != NULL) && (strlen(first) != 0) &&
	(second != NULL) && (strlen(second) != 0),
	"invalid value pair");

	if (!convertTo<string, uint32_t>(first, index)) {
	ALOGE("%s: Invalid index(%s) found", __FUNCTION__, first);
	}
	addCriterionTypeValuePair(typeName, index, second);
	} else {

	uint32_t pfwIndex = isInclusive ? 1 << index : index;
	addCriterionTypeValuePair(typeName, pfwIndex, valueName);
	index += 1;
	}
	}
	valueName = strtok_r(NULL, ",", &ctx);
	}
	free(valueNames);
	}
	}

	void ParameterManagerWrapper::loadInclusiveCriterionType(cnode *root)
	{
	ALOG_ASSERT(root != NULL, "error in parsing file");
	cnode *node = config_find(root, gInclusiveCriterionTypeTag.c_str());
	if (node == NULL) {
	return;
	}
	loadCriterionType(node, true);
	}

	void ParameterManagerWrapper::loadExclusiveCriterionType(cnode *root)
	{
	ALOG_ASSERT(root != NULL, "error in parsing file");
	cnode *node = config_find(root, gExclusiveCriterionTypeTag.c_str());
	if (node == NULL) {
	return;
	}
	loadCriterionType(node, false);
	}

	void ParameterManagerWrapper::parseChildren(cnode *root, string &defaultValue, string &type)
	{
	ALOG_ASSERT(root != NULL, "error in parsing file");
	cnode *node;
	for (node = root->first_child; node != NULL; node = node->next) {
	ALOG_ASSERT(node != NULL, "error in parsing file");

	if (string(node->name) == gDefaultTag) {
	defaultValue = node->value;
	} else if (string(node->name) == gTypeTag) {
	type = node->value;
	} else {
	ALOGE("%s: Unrecognized %s %s node", __FUNCTION__, node->name, node->value);
	}
	}
	}

	template <typename T>
	T ParameterManagerWrapper::getElement(const string &name, std::map<string, T > &elementsMap)
	{
	parameterManagerElementSupported<T>();
	typename std::map<string, T *>::iterator it = elementsMap.find(name);
	ALOG_ASSERT(it != elementsMap.end(), "Element %s not found", name.c_str());
	return it != elementsMap.end() ? it->second : NULL;
	}

	template <typename T>
	const T ParameterManagerWrapper::getElement(const string &name, const std::map<string, T > &elementsMap) const
	{
	parameterManagerElementSupported<T>();
	typename std::map<string, T *>::const_iterator it = elementsMap.find(name);
	ALOG_ASSERT(it != elementsMap.end(), "Element %s not found", name.c_str());
	return it != elementsMap.end() ? it->second : NULL;
	}

	void ParameterManagerWrapper::loadCriteria(cnode *root)
	{
	ALOG_ASSERT(root != NULL, "error in parsing file");
	cnode *node = config_find(root, gCriterionTag.c_str());

	if (node == NULL) {
	ALOGW("%s: no inclusive criteria found", __FUNCTION__);
	return;
	}
	for (node = node->first_child; node != NULL; node = node->next) {
	loadCriterion(node);
	}
	}

	void ParameterManagerWrapper::addCriterion(const string &name, const string &typeName,
	const string &defaultLiteralValue)
	{
	ALOG_ASSERT(mPolicyCriteria.find(name) == mPolicyCriteria.end(),
	"Route Criterion %s already added", name.c_str());

	ISelectionCriterionTypeInterface *criterionType =
	getElement<ISelectionCriterionTypeInterface>(typeName, mPolicyCriterionTypes);

	ISelectionCriterionInterface *criterion =
	mPfwConnector->createSelectionCriterion(name, criterionType);

	mPolicyCriteria[name] = criterion;
	int numericalValue = 0;
	if (!criterionType->getNumericalValue(defaultLiteralValue.c_str(), numericalValue)) {
	ALOGE("%s; trying to apply invalid default literal value (%s)", __FUNCTION__,
	defaultLiteralValue.c_str());
	}
	criterion->setCriterionState(numericalValue);
	}

	void ParameterManagerWrapper::loadCriterion(cnode *root)
	{
	ALOG_ASSERT(root != NULL, "error in parsing file");
	const char *criterionName = root->name;

	ALOG_ASSERT(mPolicyCriteria.find(criterionName) == mPolicyCriteria.end(),
	"Criterion %s already added", criterionName);

	string paramKeyName = "";
	string path = "";
	string typeName = "";
	string defaultValue = "";

	parseChildren(root, defaultValue, typeName);

	addCriterion(criterionName, typeName, defaultValue);
	}

	void ParameterManagerWrapper::loadConfig(cnode *root)
	{
	ALOG_ASSERT(root != NULL, "error in parsing file");
	cnode *node = config_find(root, gPolicyConfTag.c_str());
	if (node == NULL) {
	ALOGW("%s: Could not find node for pfw", __FUNCTION__);
	return;
	}
	ALOGD("%s: Loading conf for pfw", __FUNCTION__);
	loadInclusiveCriterionType(node);
	loadExclusiveCriterionType(node);
	loadCriteria(node);
	}


	status_t ParameterManagerWrapper::loadAudioPolicyCriteriaConfig(const char *path)
	{
	ALOG_ASSERT(path != NULL, "error in parsing file: empty path");
	cnode *root;
	char *data;
	ALOGD("%s", __FUNCTION__);
	data = (char *)load_file(path, NULL);
	if (data == NULL) {
	return -ENODEV;
	}
	root = config_node("", "");
	ALOG_ASSERT(root != NULL, "Unable to allocate a configuration node");
	config_load(root, data);

	loadConfig(root);

	config_free(root);
	free(root);
	free(data);
	ALOGD("%s: loaded", __FUNCTION__);
	return NO_ERROR;
	}

	bool ParameterManagerWrapper::isStarted()
	{
	return mPfwConnector && mPfwConnector->isStarted();
	}

	status_t ParameterManagerWrapper::setPhoneState(audio_mode_t mode)
	{
	ISelectionCriterionInterface *criterion =
	getElement<ISelectionCriterionInterface>(gPhoneStateCriterionTag, mPolicyCriteria);
	if (criterion == NULL) {
	ALOGE("%s: no criterion found for %s", __FUNCTION__, gPhoneStateCriterionTag.c_str());
	return BAD_VALUE;
	}
	if (!isValueValidForCriterion(criterion, static_cast<int>(mode))) {
	return BAD_VALUE;
	}
	criterion->setCriterionState((int)(mode));
	applyPlatformConfiguration();
	return NO_ERROR;
	}

	audio_mode_t ParameterManagerWrapper::getPhoneState() const
	{
	const ISelectionCriterionInterface *criterion =
	getElement<ISelectionCriterionInterface>(gPhoneStateCriterionTag, mPolicyCriteria);
	if (criterion == NULL) {
	ALOGE("%s: no criterion found for %s", __FUNCTION__, gPhoneStateCriterionTag.c_str());
	return AUDIO_MODE_NORMAL;
	}
	return static_cast<audio_mode_t>(criterion->getCriterionState());
	}

	status_t ParameterManagerWrapper::setForceUse(audio_policy_force_use_t usage,
	audio_policy_forced_cfg_t config)
	{
	// @todo: return an error on a unsupported value
	if (usage > AUDIO_POLICY_FORCE_USE_CNT) {
	return BAD_VALUE;
	}

	ISelectionCriterionInterface *criterion =
	getElement<ISelectionCriterionInterface>(gForceUseCriterionTag[usage], mPolicyCriteria);
	if (criterion == NULL) {
	ALOGE("%s: no criterion found for %s", __FUNCTION__, gForceUseCriterionTag[usage].c_str());
	return BAD_VALUE;
	}
	if (!isValueValidForCriterion(criterion, static_cast<int>(config))) {
	return BAD_VALUE;
	}
	criterion->setCriterionState((int)config);
	applyPlatformConfiguration();
	return NO_ERROR;
	}

	audio_policy_forced_cfg_t ParameterManagerWrapper::getForceUse(audio_policy_force_use_t usage) const
	{
	// @todo: return an error on a unsupported value
	if (usage > AUDIO_POLICY_FORCE_USE_CNT) {
	return AUDIO_POLICY_FORCE_NONE;
	}
	const ISelectionCriterionInterface *criterion =
	getElement<ISelectionCriterionInterface>(gForceUseCriterionTag[usage], mPolicyCriteria);
	if (criterion == NULL) {
	ALOGE("%s: no criterion found for %s", __FUNCTION__, gForceUseCriterionTag[usage].c_str());
	return AUDIO_POLICY_FORCE_NONE;
	}
	return static_cast<audio_policy_forced_cfg_t>(criterion->getCriterionState());
	}

	bool ParameterManagerWrapper::isValueValidForCriterion(ISelectionCriterionInterface *criterion,
	int valueToCheck)
	{
	const ISelectionCriterionTypeInterface *interface = criterion->getCriterionType();
	string literalValue;
	return interface->getLiteralValue(valueToCheck, literalValue);
	}

	status_t ParameterManagerWrapper::setAvailableInputDevices(audio_devices_t inputDevices)
	{
	ISelectionCriterionInterface *criterion =
	getElement<ISelectionCriterionInterface>(gInputDeviceCriterionTag, mPolicyCriteria);
	if (criterion == NULL) {
	ALOGE("%s: no criterion found for %s", __FUNCTION__, gInputDeviceCriterionTag.c_str());
	return DEAD_OBJECT;
	}
	criterion->setCriterionState(inputDevices & ~AUDIO_DEVICE_BIT_IN);
	applyPlatformConfiguration();
	return NO_ERROR;
	}

	status_t ParameterManagerWrapper::setAvailableOutputDevices(audio_devices_t outputDevices)
	{
	ISelectionCriterionInterface *criterion =
	getElement<ISelectionCriterionInterface>(gOutputDeviceCriterionTag, mPolicyCriteria);
	if (criterion == NULL) {
	ALOGE("%s: no criterion found for %s", __FUNCTION__, gOutputDeviceCriterionTag.c_str());
	return DEAD_OBJECT;
	}
	criterion->setCriterionState(outputDevices);
	applyPlatformConfiguration();
	return NO_ERROR;
	}

	void ParameterManagerWrapper::applyPlatformConfiguration()
	{
	mPfwConnector->applyConfigurations();
	}

	} // namespace audio_policy
	} // namespace android